Implement commands to uninstall cluster applications

This is the backend part which just allows uninstalling Prometheus for
now.

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/gitlab/kubernetes/helm/delete_command.rb b/lib/gitlab/kubernetes/helm/delete_command.rb
new file mode 100644
index 00000000000..876994d2678
--- /dev/null
+++ b/lib/gitlab/kubernetes/helm/delete_command.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Kubernetes
+    module Helm
+      class DeleteCommand
+        include BaseCommand
+        include ClientCommand
+
+        attr_accessor :name, :files
+
+        def initialize(name:, rbac:, files:)
+          @name = name
+          @files = files
+          @rbac = rbac
+        end
+
+        def generate_script
+          super + [
+            init_command,
+            wait_for_tiller_command,
+            delete_command
+          ].compact.join("\n")
+        end
+
+        def pod_name
+          "uninstall-#{name}"
+        end
+
+        def rbac?
+          @rbac
+        end
+
+        private
+
+        def delete_command
+          command = ['helm', 'delete', '--purge', name] + optional_tls_flags
+
+          command.shelljoin
+        end
+
+        def optional_tls_flags
+          return [] unless files.key?(:'ca.pem')
+
+          [
+            '--tls',
+            '--tls-ca-cert', "#{files_dir}/ca.pem",
+            '--tls-cert', "#{files_dir}/cert.pem",
+            '--tls-key', "#{files_dir}/key.pem"
+          ]
+        end
+      end
+    end
+  end
+end